Coupled Vibration Analysis of Submerged Floating Tunnel System in Wave and Current

Chen, Zhengyang; Xiang, Yiqiang; Lin, Heng; Yang, Ying

doi:10.3390/app8081311

Cited by 29 publications

(14 citation statements)

References 30 publications

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“…Xiang and Chao [17] adopted this model to study the vortex-induced vibration of cable under the action of current, which analyzed the influence of water flow velocity, cable inclination angle and tunnel buoyancy ratio on the structure response. Chen et al [18] used this model to study the coupled vibration analysis of submerged floating tunnel in wave and current. Besides, the paper analyzed the influence of water flow velocity, cable inclination and wave period.…”

Section: Introductionmentioning

confidence: 99%

Coupling Vibration Model of Submerged Floating Tunnel in Space

Li¹,

Zhang²,

Liu³

et al. 2022

J Nonlinear Math Phys

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Submerged floating tunnel is a new type of traffic building structure under water surface which can span various water courses. The structure has the characteristics of high flexibility and low damping so that vibration problems would be caused by hydrodynamic excitation. Long-term vibration problems could affect the safety and durability of the structure. Therefore, it is necessary to accurately understand the dynamic behavior of the floating tunnel under hydrodynamic excitation. This paper proposes a simplified three-dimensional model to study vibration of the structure for the excitation. Based on the Galerkin method and the mode superposition method with the boundary conditions, the dynamic differential equations of the structure were established in Generalized coordinate system. The $$Newmark - \beta$$ N e w m a r k - β method is used to solve the equations. Then, adopting FEA (Finite Element Analysis) method to establish the finite element model of the submerged floating tunnel. The result verified the accuracy of the present model. Based on the present model for parameter analysis, the following conclusions are: displacement coordination at the connection position affects the cables’ dynamic behavior greatly compared to tube. Current and horizontal component of wave have significant impact on dynamic response of tube. While the vertical wave component influences cable greatly.

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Section: Introductionmentioning

confidence: 99%

Coupling Vibration Model of Submerged Floating Tunnel in Space

Li¹,

Zhang²,

Liu³

et al. 2022

J Nonlinear Math Phys

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show abstract

“…Environmental loads include waves, earthquakes, currents, and tsunamis. Among them, waves tend to be the most important environmental loading if the submergence depth is not sufficiently large [3][4][5][6][7]. For SFT with a large diameter, it was found through hydro-elastic analysis that large static and dynamic mooring tensions were critical issues [7].…”

Section: Introductionmentioning

confidence: 99%

Mooring-Failure Monitoring of Submerged Floating Tunnel Using Deep Neural Network

et al. 2020

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This paper presents a machine learning method for detecting the mooring failures of SFT (submerged floating tunnel) based on DNN (deep neural network). The floater-mooring-coupled hydro-elastic time-domain numerical simulations are conducted under various random wave excitations and failure/intact scenarios. Then, the big-data is collected at various locations of numerical motion sensors along the SFT to be used for the present DNN algorithm. In the input layer, tunnel motion-sensor signals and wave conditions are inputted while the output layer provides the probabilities of 21 failure scenarios. In the optimization stage, the numbers of hidden layers, neurons of each layer, and epochs for reliable performance are selected. Several activation functions and optimizers are also tested for the present DNN model, and Sigmoid function and Adamax are respectively adopted to enhance the classification accuracy. Moreover, a systematic sensitivity test with respect to the numbers and arrangements of sensors is performed to find the appropriate sensor combination to achieve target prediction accuracy. The technique of confusion matrix is used to represent the accuracy of the DNN algorithms for various cases, and the classification accuracy as high as 98.1% is obtained with seven sensors. The results of this study demonstrate that the DNN model can effectively monitor the mooring failures of SFTs utilizing real-time sensor signals.

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“…It was found that the vortex-induced vibration resonance occurred and the axial stress of the structure increased significantly. Chen et al [20] proposed a simplified theoretical model for vibration analysis of the coupled SFT tube-cable system under wave and current.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Vortex Induced Vibration for Submerged Floating Tunnel under Different Reynolds Numbers

Jin

Liu

Geng

et al. 2020

Water

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A 2D numerical model was established to investigate vortex induced vibration (VIV) for submerged floating tunnel (SFT) by solving incompressible viscous Reynolds average Navier-Stokes equations in the frame of Abitrary Lagrangian Eulerian (ALE). The numerical model was closed by solving SST k-ω turbulence model. The present numerical model was firstly validated by comparing with published experimental data, and the comparison shows that good achievement is obtained. Then, the numerical model is used to investigate VIV for SFT under current. In the simulation, the SFT was allowed to oscillate in cross flow direction only under the constraint of spring and damping. The force coefficients and motion of SFT were obtained under different reduced velocity. Further research showed that Reynolds number has not only a great influence on the vibration amplitude and ‘lock-in’ region, but also on the force coefficients on of the SFT. A large Reynolds number results in a relatively small ‘lock-in’ region and force coefficient.

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Coupled Vibration Analysis of Submerged Floating Tunnel System in Wave and Current

Cited by 29 publications

References 30 publications

Coupling Vibration Model of Submerged Floating Tunnel in Space

Coupling Vibration Model of Submerged Floating Tunnel in Space

Mooring-Failure Monitoring of Submerged Floating Tunnel Using Deep Neural Network

Numerical Investigation of Vortex Induced Vibration for Submerged Floating Tunnel under Different Reynolds Numbers

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